(Corrects Vodafone's total subscriber number in paragraph 3 to 152.7 million, from 52.7 million)

Oct 12 (Reuters) - Top Indian telecoms carrier Bharti Airtel

lost almost 1 million mobile customers in September, data released by an industry body showed, as carriers in the world's second-biggest wireless services market continue to disconnect inactive users in a clean-up drive.

Bharti's mobile customer base declined 0.98 million to 185.9 million as of September, the Cellular Operators Association of India said on Friday.

Second-ranked Vodafone India's mobile customers declined 0.69 million to 152.7 million during the month, while fourth-ranked Idea Cellular lost 0.51 million mobile customers to 115.5 million, the industry body said.

(Reporting by Devidutta Tripathy in New Delhi; Editing by Subhranshu Sahu)